Provided is a bulb-type lamp including a lightweight housing with great handleability. The insert can be removed and replaced when required for washing or for immersion in water to absorb moisture which is then retained in the insert for the purpose of providing evaporative cooling. This PET-based polyester material can be obtained either by the additionblending of polyester polymers containing CHDM monomeric units to PET material andor the incorporation of CHDM monomer units into a PET-polymer backbone at appropriate levels. The inner tubular member has a second angular offset.